Datasheet
Table Of Contents
- General Description
- Key Features
- Applications
- System Diagrams
- Contents
- Figures
- Tables
- Legal
- Product Family
- 1 Terms and Definitions
- 2 Block Diagram
- 3 Pinout
- 4 Characteristics
- 5 Functional Description
- 5.1 Features Description
- Driving LRA and ERM Actuators
- Automatic LRA Resonant Frequency Tracking
- Wideband LRA Support
- I2C and PWM Input Streaming
- Low Latency I2C/GPI Wake-Up from IDLE State
- Three GPI Sequence Triggers for up to Six Independent Haptic Responses
- On-Board Waveform Memory with Amplitude, Time, and Frequency Control
- Active Acceleration and Rapid Stop for High-Fidelity Haptic Feedback
- Continuous Actuator Diagnostics and Fault Handling
- No Software Requirements with Embedded Operation
- Differential Output Drive
- Current Driven System
- Configurable EMI Suppression
- Automatic Short Circuit Protection
- Ultra-Low Power Consumption with State Retention
- Ultra-Low Latency in STANDBY State
- Supply Monitoring, Reporting, and Automatic Output Limiting
- Open- and Closed-Loop Modes
- Open-Loop Sine/Custom Wave Drive Support
- Small Solution Footprint
- Additional Features
- 5.2 Functional Modes
- 5.3 Resonant Frequency Tracking
- 5.4 Active Acceleration and Rapid Stop
- 5.5 Wideband Frequency Control
- 5.6 Device Configuration and Playback
- 5.7 Advanced Operation
- 5.7.1 Frequency Tracking
- 5.7.2 Rapid Stop
- 5.7.3 Initial Impedance Update
- 5.7.4 Amplitude PID
- 5.7.5 Wideband Operation
- 5.7.6 Custom Waveform Operation
- 5.7.7 Embedded Operation
- 5.7.8 Polarity Change Reporting for Half-Period Control in DRO Mode
- 5.7.9 Loop Filter Configuration
- 5.7.10 UVLO Threshold
- 5.7.11 Edge Rate Control
- 5.7.12 Double Output Current Range
- 5.7.13 Supply Monitoring, Reporting, and Automatic Output Limiting
- 5.7.14 BEMF Fault Limit
- 5.7.15 Increasing Impedance Detection Accuracy
- 5.7.16 Frequency Pause during Rapid Stop
- 5.7.17 Frequency Pause during Rapid Stop
- 5.7.18 Coin ERM Operation
- 5.8 Waveform Memory
- 5.9 General Data Format
- 5.10 I2C Control Interface
- 5.1 Features Description
- 6 Register Overview
- 7 Package Information
- 8 Ordering Information
- 9 Application Information
- 10 Layout Guidelines
DA7280
LRA/ERM Haptic Driver with Multiple Input Triggers,
Integrated Waveform Memory and Wideband Support
Datasheet
Revision 3.0
30-Jul-2019
CFR0011-120-00
29 of 76
© 2019 Dialog Semiconductor
5.6.5.3 PWM Mode
Figure 14 shows how to operate the device in PWM mode.
1. Starting from either the IDLE or STANDBY state, apply a PWM signal to the GPI_0/PWM pin.
2. When ready to begin playback, set OPERATION_MODE = 2. The output will begin switching
after approximately 0.75 ms with a drive amplitude proportional to the duty cycle of the incoming
PWM signal.
3. While in the DRIVE state, update the duty cycle of the PWM signal to drive a new amplitude level
and create the desired envelope of the haptic sequence. If the duty cycle of the PWM signal falls
below the threshold set by FULL_BRAKE_THR, it is interpreted as a zero output drive level.
4. In order to stop driving, set OPERATION_MODE = 0. DA7280 will return to either the IDLE or
STANDBY state depending on the value of STANDBY_EN.
Note: The duty cycle of the PWM signal is interpreted differently depending on the value of
ACCELERATION_EN. If ACCELERATION_EN = 1, then zero drive corresponds to 50 % duty cycle ±
FULL_BRAKE_THR. If ACCELERATION_EN = 0, then zero drive corresponds to 0 % duty cycle +
FULL_BRAKE_THR. For further explanation, see Figure 30 and Figure 31.
I
2
C write to stop driving
I
2
C writes to start driving
Apply PWM signal
to GPI_0/PWM pin
Output starts
switching
Write
OPERATION_
MODE = 2
IDLE/STANDBY
DRIVE
Write
OPERATION_
MODE = 0
DA7280
stops
driving
Change the duty
cycle of the PWM
signal
Drive
amplitude
changes
Figure 14: Operation in PWM Mode